Combined axle structure of a stator assembly for a radiator fan

ABSTRACT

A combined axle structure of a stator assembly for a radiator fan, of which said radiator fan comprises: a pedestal, a stator assembly, a rotor blade unit and a reverse axle. The pedestal includes a sustaining face and a stator assembly face. The stator assembly includes silicon-steel sheet, coil and insulated frame. The insulated frame is mated with a metal bearing block, which is designed like a cup, and includes a bottom wall and a circumferential wall. The top of the circumferential wall is positioned into the insulated frame. An axle socket is set at the center of the bottom wall, allowing for insertion of the bottom of the reverse axle. An embedded locator is set centrally into the stator assembly face of the pedestal, allowing for mating with the bottom of the metal bearing block.

CROSS-REFERENCE TO RELATED U.S. APPLICATIONS

Not applicable.

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

Not applicable.

NAMES OF PARTIES TO A JOINT RESEARCH AGREEMENT

Not applicable.

REFERENCE TO AN APPENDIX SUBMITTED ON COMPACT DISC

Not applicable.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates generally to a partial structure of radiator fan, and more particularly to an innovative one which is designed with a combined axle structure of a stator assembly.

2. Description of Related Art Including Information Disclosed Under 37 CFR 1.97 and 37 CFR 1.98.

If the axle of a conventional radiator fan is set laterally onto the hub, there exist some matching errors, such as: the matching error between the axle and rotor hub, or that between the rotor's magnetic ring and stator coil, or that between the axle and stator bearing, or that between the stator bearing and bearing block. Hence, louder noises may occur due to mismatching in manufacturing of the radiator fan.

For this reason, a reverse radiator fan has been developed in such a manner that the axle of rotor is reversely mated onto the stator pedestal, realizing accurate perpendicularity between the axle and stator pedestal. Yet, the coil assembly of the stator is generally assembled onto the preformed cylinder of the stator pedestal in a single modular form. After completion of assembly, larger matching errors may occur, so the mismatching between the coil assembly and rotor's magnetic ring will lead to unsmooth operation and louder noises.

Thus, to overcome the aforementioned problems of the prior art, it would be an advancement if the art to provide an improved structure that can significantly improve the efficacy.

Therefore, the inventor has provided the present invention of practicability after deliberate design and evaluation based on years of experience in the production, development and design of related products.

BRIEF SUMMARY OF THE INVENTION

The enhanced efficacy of the present invention is as follows:

Based on the unique design of the present invention wherein the “combined axle structure of stator assembly for radiator fan” allows the reverse axle to be assembled onto said metal bearing block, and the metal bearing block and the pedestal are assembled firmly, the metal bearing block and stator assembly of the present invention could be accurately matched by means of injection molding. Meanwhile, the reverse axle and metal bearing block are combined metalicly with excellent matching accuracy and concentricity, such that the reverse axle and stator assembly can be accurately matched. And, the matching error of the stator assembly and pedestal has no effect on the assembly matching of the stator assembly, axle and rotor blade unit. The combined structure of the radiator fan allows for great improvement of the matching accuracy, guarantees more smooth operation and reduces efficiently the noises with better applicability.

The improvements brought about by this invention are as follow:

Based on the structural configuration wherein a locating column is formed onto the insulated frame of the stator assembly, a through-hole is set correspondingly to the pedestal for penetration of the locating column, and a hot-melt expanded end is formed onto the locating column for abutting onto the sustaining face of the pedestal, the stator assembly and the pedestal can be assembled more stably and firmly.

Although the invention has been explained in relation to its preferred embodiment, it is to be understood that many other possible modifications and variations can be made without departing from the spirit and scope of the invention as hereinafter claimed.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

FIG. 1 is an exploded perspective view of the preferred embodiment of the radiator fan of the present invention.

FIG. 2 is an exploded sectional view of the preferred embodiment of the radiator fan of the present invention.

FIG. 3 is an assembled sectional view of the preferred embodiment of the radiator fan of the present invention.

FIG. 4 is an assembled sectional view of another preferred embodiment of the present invention.

FIG. 5 is an assembled sectional view of other preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

FIGS. 1 and 2 depict preferred embodiments of a combined axle structure of radiator fan's stator assembly of the present invention, which, however, are provided for only explanatory objective for patent claims. Said radiator fan A comprises of a pedestal 10, a stator assembly 20, a rotor blade unit 30 and a reverse axle 40 (a metal axle). Of which, the pedestal 10 includes a sustaining face 11 and a stator assembly face 12. A circuit board 13 is set on the stator assembly face 12. The stator assembly 20 includes silicon-steel sheet 21, coil 22 and insulated frame 23. Among which, the insulated frame 23 is mated with a metal bearing block 50, which is a copper block set like a cup. It includes a bottom wall 51 and a circumferential wall 52, of which the top of the circumferential wall 52 is positioned into the inner flange of the insulated frame 23. An axle socket 53 is set at the center of the bottom wall 51, allowing for insertion of the bottom 41 of the reverse axle 40. An embedded locator 14 is set centrally into the stator assembly face 12 of the pedestal 10, allowing for mating with the bottom of the metal bearing block 50.

Of which, the embedded locator 14 for the pedestal 10 can have a through-hole or grooved pattern. Referring to FIGS. 2 and 3, when the embedded locator 14 is a through-hole, an annular flange 54 is protruded on the bottom of the metal bearing block 50, such that an expanded ring slot 141 is set correspondingly at the bottom of the through-hole embedded locator 14, allowing for abutting and embedding of the annular flange 54. Of which, the annular flange 54 at bottom of the metal bearing block 50 and the embedded locator 14 can be fixed by adhesive. Moreover, the peripheral surface at bottom of the metal bearing block 50 can have a rough surface correspondingly to the embedded locator 14, thus increasing the inserting fixation.

Referring to FIG. 4, a locating column 60 is formed onto the insulated frame 23 of the stator assembly 20 and protruded towards the pedestal 10, such that a through-hole 15 is set correspondingly to the pedestal 10 for penetration of the locating column 60. A hot-melt expanded end 61 is formed onto the locating column 60 for abutting onto the sustaining face 11 of the pedestal 10, so that the stator assembly 20 and pedestal 10 can be assembled more stably.

Furthermore, the structure of said rotor blade unit 30 is not improved in the present invention, but represented by typical units, which comprise: a hub 31, several blades 32, an axle bush 33, a bearing 34 and a magnetic ring 35 as shown in FIGS. 1 and 2. Of which, said blades 32 are protruded at interval onto the periphery of the hub 31, the axle bush 33 is set into the center of the hub 31, the bearing 34 is assembled into the axle bush 33 for insertion of the reverse axle 40, and the magnetic ring 35 is set annularly onto the circumferential wall of the hub 31.

Based upon above-specified structure, when the stator assembly 20 of the radiator fan A of the present invention is fabricated, the silicon-steel sheet 21, axle 40 and metal bearing block 50 can be located into an injection molding template, enabling injection coating of the insulated frame 23. The reverse axle 40 is inserted into the axle socket 53 set at the center of the bottom wall 51 of the metal bearing block 50, such that the reverse axle 40 is accurately located onto the center of the stator assembly 20, thus forming a stator assembly 20 of high accuracy. Next, the stator assembly 20 can be accurately assembled onto the pedestal 10 based on the embedded matching of the metal bearing block 50 and the embedded locator 14 set at the center of the stator assembly face 12 of the pedestal 10.

Referring also to FIG. 5, a ring groove 55 or spacing groove is set at bottom of the metal bearing block 50, such that the pedestal 10 made of plastics can be firmly mated with the ring groove 55 or spacing groove at bottom of the metal bearing block 50 by means of injection coating. 

1. A combined axle structure of a stator assembly for a radiator fan, of which the radiator fan comprises: a pedestal, a stator assembly, a rotor blade unit and a reverse axle; the pedestal includes a sustaining face and a stator assembly face; a circuit board is set on the stator assembly face; the stator assembly includes silicon-steel sheet, coil and insulated frame; among which, the insulated frame is mated with a metal bearing block, which is formed like a cup, and includes a bottom wall and a circumferential wall; of which the top of the circumferential wall is positioned into the insulated frame; an axle socket is set at the center of the bottom wall, allowing for insertion of the bottom of the reverse axle; an embedded locator is set centrally into the stator assembly face of the pedestal, allowing for mating with the bottom of the metal bearing block.
 2. The structure defined in claim 1, wherein the embedded locator for the pedestal is a through-hole or a grooved pattern; when the embedded locator is a through-hole, an annular flange is protruded on the bottom of the metal bearing block, such that an expanded ring slot is set correspondingly at the bottom of the through-hole embedded locator, allowing for abutting and embedding of the annular flange.
 3. The structure defined in claim 2, wherein the annular flange at bottom of the metal bearing block and the embedded locator can be fixed by adhesive.
 4. The structure defined in claim 1, wherein the peripheral surface at bottom of the metal bearing block can be a rough surface correspondingly to the embedded locator.
 5. The structure defined in claim 1, wherein a ring groove or spacing groove is set at bottom of the metal bearing block, such that the pedestal made of plastics can be firmly mated with the ring groove or spacing groove at bottom of the metal bearing block by means of injection coating.
 6. The structure defined in claim 1, wherein a locating column is formed onto the insulated frame of the stator assembly and protruded towards the pedestal, such that a through-hole is set correspondingly to the pedestal for penetration of the locating column; and a hot-melt expanded end is formed onto the locating column for abutting onto the sustaining face of the pedestal. 